#define _CRT_SECURE_NO_WARNINGS


#include <iostream>
#include <stdio.h>
#include <Windows.h>

HANDLE createPortHandle(const char* port, int baudrate)
{
	HANDLE portHandle = CreateFile(port, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
	if (portHandle == INVALID_HANDLE_VALUE)
	{
		printf("Cannot open port!\n");
		return INVALID_HANDLE_VALUE;
	}

	DCB params = { 0 };
	params.DCBlength = sizeof(params);
	GetCommState(portHandle, &params);
	params.BaudRate = baudrate;
	params.ByteSize = 8;
	params.StopBits = 0;
	params.Parity = 0;
	SetCommState(portHandle, &params);

	COMMTIMEOUTS timeouts = { 0 };
	timeouts.ReadIntervalTimeout = 10;
	timeouts.ReadTotalTimeoutConstant = 1;
	timeouts.ReadTotalTimeoutMultiplier = 1;
	timeouts.WriteTotalTimeoutConstant = 50;
	timeouts.WriteTotalTimeoutMultiplier = 50;
	SetCommTimeouts(portHandle, &timeouts);

	return portHandle;
}

static bool terminate = false;

DWORD _stdcall readFunction(void* params)
{
	HANDLE portHandle = *(HANDLE*)params;

	char message[256];
	DWORD bytesRead;

	while (!terminate)
	{
		ReadFile(portHandle, message, 256, &bytesRead, 0);
		if (bytesRead > 0)
		{
			printf("Received message: %s\n", message);
		}
		Sleep(100);
	}

	return 0;

}


int main()
{
	printf("Enter port: ");
	char portName[100];
	scanf("%s", portName);

	HANDLE portHandle = createPortHandle(portName, 115200);
	if (portHandle == INVALID_HANDLE_VALUE)
	{
		return -1;
	}

	DWORD threadId;
	HANDLE threadHandle = CreateThread(NULL, 0, readFunction, &portHandle, 0, &threadId);

	char message[256];
	do
	{
		fgets(message, 256, stdin);
		message[strlen(message) - 1] = '\0';

		if (strlen(message) > 0)
		{
			DWORD bytesSent;
			WriteFile(portHandle, message, strlen(message) + 1, &bytesSent, 0);
			printf("Number of bytes sent: %ld\n", bytesSent);
		}
	}
	while (strcmp(message, "x") != 0);

	terminate = true;
	WaitForSingleObject(threadHandle, INFINITE);
	CloseHandle(threadHandle);

	CloseHandle(portHandle);
	return 0;
}